What is it that changes an objects momentum?

What is the velocity (in m/s) of a 550 kg roller coaster cart at the bottom of the track if it started with 990,000 J of gravitational potential energy at the top of the track? Assume a frictionless surface.

11. As you are sitting in your chair the force of gravity is pulling you down. What force is causing you to stay in the chair instead of falling through the chair? A. applied. B. normal. C. gravity. D. friction.

What is your body's metabolic power use while running the generator to power your laptop charger, given the typical efficiency for such tasks? Assume 100% efficiency for the generator.

A baseball rolling along the floor has potential energy kinetic energy thermal energy conservation of energy

If we assume a tank is at rest and there's a car moving at 100mph, which one has the most inertia?

Which of the two resistors dissipates the larger amount of power?

Three students derive the following equations in which x refers to distance traveled, v the speed, a the acceleration (m/s^2), and t the time, and the subscript (0) means a quantity at time t=0: a) x=vt^2 + 2at, b) x=v0t+1/2at^2, and c) x=v0t+2at^2.

Which is a use of fiber optics?

When a positively charged conductor touches a neutral conductor, the neutral conductor will:

Definition of the rule E=mc^2